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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a34e952a3f3c7ea81d4b418fc91afe9b4d7e07fada7d54ba37d464827532509' 
  AND token = 'wt0ER2fXQB9Biwa/kGD+pF/t+0Lu/lyAkt5hQRAdtaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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