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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0455b17cdd3fefbf8ca3383a9f0f11ffe123567a06080d83941e4babb9deb8a0' 
  AND token = '6QejhWpfSphnSq1wP0Xo3bWHJq9s3WSC/nalaspZo1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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