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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdecae9656d4a56e9fd0efd782f5aa84f5ad5529886db5429ce51d5ad69dab24' 
  AND token = 'P9Vqd70YPccqGLSgaWLOqAuf/9zjP7ZAT15qtDOiB4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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