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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a407e0c4f2c81ef7c8ede6ec96cbc1b6e8f27dd16324e7361ea27d740efdcd' 
  AND token = '6axZELA/onXo3TFkVs3Wd7PebUUa8HNF89mePYgF/80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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