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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad5daa2e1359e63f5f2885b30d81ff9495292badca6b0bda2d868332940f89a' 
  AND token = 'OYRAHP0zviVFpntXVIaE9Jbcw1XVHn1gWJBPlzanwnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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