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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad05c9d5d6624aa1a422b8c72b14598efc10e93559c9e95a87205f0d6ba41ed2' 
  AND token = 'PB8eEVaYBVH5pKEUiMw0IYuhtvHb75f7JXeRUxE0Jjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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