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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dcb799ef9c907453f2933b6cab88f1721b5f8c6116b0fe93a30c8ca7e1c2c7' 
  AND token = 'XMcs4CjIIRukEoj3l135dUu7wIQO0+38N2nLzffc76c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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