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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a89d82b0e1e2c58a5da166e9c108a89b48b7209b472c7116ddc1db0334bb0c' 
  AND token = '2zMmmwbpojUi0p4EGwFaN9UeusNTtce/77uGspzpHWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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