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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62718ac8b54601c8e7d5be333386c74ab0cd40a57e4ceb6ac78270c8b980edb0' 
  AND token = 'IJApHpLg69jlv/kMZEuPuWCEMzz42iCz0q8CEaPe+Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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