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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fd42bb629e2da2a3e1fb0aed602368903a292a7504907cf32140f14219bead' 
  AND token = '3QZnqxZw01PFFu5682Lj5ZZfDpBNSGnZA41NsGJPIJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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