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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f3f97832b985b6088ce9f4928cf2bcf120c5fe7a9c3fc79df5c634fdeeefa1' 
  AND token = 'eK//z3OLWNcdYr6Otb2w89X5Ui8Vm19MfqkYVF8xk8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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