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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b57aa2be34c804d022debeb3bada5c122a9ab983a6b78535141572f7fec97f' 
  AND token = 'omRhAzUA5x3gx7N70LBbOAkCHBR0ntrU6qyPWZgy14g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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