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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263c73140897a759607909c5be870e707b9a784a09fb9a7e7015f3fab50b8f23' 
  AND token = 'YETKR4vr/WV+TMaaL56EfbSfIXeMXkugl95smsY6cFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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