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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b092b2ff679911001ce1abbad61d30f3206dd71b70edd4ac758d0b3b9cc2fd' 
  AND token = 'PIxQHCxZQQcnCO9rIU8wNoWbu5GFLWH2K/B4ZGQZb/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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