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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc77b35cddcd661a0ac3297e40a66b8ae27127d7308e62be086a2d0de456154' 
  AND token = 'WcMn5VGx+09XmpZOG8IV9HxONoDbW4H+DD8OdfOklFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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