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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8456d7a43a6eb9899133bc6d85ec96c714c3bce3fd9545009f04711d407b14' 
  AND token = 'LM2p+u0xzvnV28Z8HJxEI2Jg560U07XQMNkwn1koUp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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