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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be47369d33a82ccdf5af44bbcc7a60a9888667287aa0687e4c5dba749362edd1' 
  AND token = '80OCsm4pIlwuIHylQR60wc196ll8KZhgJfOyDt8tLQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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