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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcf608e8fa9b6564d4d460690da44a867bac9c2a6e2bb6299ad48efccfe6335' 
  AND token = 'hfWl/XaQ/BgmbrKmKfK2Hqgqxb67QCgRZbfY2ejVYDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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