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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae2f1308a9d82035257f2f98dfa10193859daf2a3cc7edacf2647f88f7eea37' 
  AND token = 'Vxa1Hi1IvnliUExPMrMkAV+2d8S3et603pSsq66YgYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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