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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e8fcbb10296c3bffe9868b1df1ec477b69689cadf7b78ed42582dee3ee9d6a' 
  AND token = 'Z7cUdz3iVjKgJlSZkQba6b8kt3/oK1nL/KafGx28z18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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