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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234308ac6a51a48ad3dbe771c8e79d596558c5078b24deca2c16abb727b97554' 
  AND token = 'Qv1LFrgDJsxRL0CxBoNg/m5V6cd5LcYJdTXQGhiSOzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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