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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c34a2faf0c924b74bef805e6d02b5eba93213168716b78472effd5a3891dcf6' 
  AND token = 'M2npQUypDV6LjpytHBEHqy6aRCqrqv6kcswB2Arbmcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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