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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8c0c62dacfb2c9a8bc96dc896074055cc586b063382830733c18639a12c745' 
  AND token = '5AQ9NdvfLrLJcFadX/czzTF9j7LiykT7XJZ0chxwxr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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