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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1870d15bcae1eeac55044ebe378cc494c2853651e3f58b9e71eaabf82682a9db' 
  AND token = '2fmSLVg35Nl9/7P2oBR3nr8Hlh2d8SJec+oQE6TqLyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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