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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37b11fd71263f499064900fd67f6912ad54fcdd7ca18a43e20dac9657e890b8' 
  AND token = 'a7jA0TXAoPZG89KC8h5PWgL8jP29sgZ1VTQdelOo3A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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