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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc1625ca50b3756867ab4506db5e91013387c5c72013a30fa34e1e0a59cd2ad' 
  AND token = 'Upc/mvwvaNcsTu9h4kQzl1jJAP98fNS1hVjCpBNXV8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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