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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fdcdbbe99bcf82c83722b8146a4d9349b1274ad8f064073034bd615a4a310b' 
  AND token = '0X/Yt6e8rdsWg32ZXOv5b/+EgEkSmB3phdFoBhNNJXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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