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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c84904a855e81a5c887738e161b034672d864e9d97b628ed822b0eb8cd4e28' 
  AND token = 'Iu8YoT35KUQzqu12QK10kfm3F5RzGaLxngpIa5HbhD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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