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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfffe1593eb2766734a319556106852828d36f63f4350efeb02e0a2eb8fa4e4' 
  AND token = 'b8AdYlCfjERr9j9Aeokw2A/qhDCJosiRoWTCrOw0tzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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