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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d5b311a1614d83027e4d7802ce315a4dee118069ae26db45fc0cf11abc63ec' 
  AND token = 'iiQ6827WZ4yodL35DsIQrZP/No+OubA8iU1dRJqQXqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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