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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6d06b764ab181b93a0f5fbd0bbc623023db4ad2f7fa72c3fd105e1c126f3b6' 
  AND token = '8DwbivuRkYVty24RK6igO2RLbnyghWeGI43F5dkClSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}