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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f81db85d2a56ac91eec6dab323ac13d743ec72e72e22115d30842b892d7b922' 
  AND token = 'hrQttR2jhzAdO4q0SiRudm0bjDJB6gItV5z94zjY8Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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