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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b657be271ea231f02f695c30950830a87af9cf810b3ed1e8d532c487c392b9c' 
  AND token = 'WpnXAvzno0b2vQGK7edxFeB4hHTyPIrWondHIOfg1XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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