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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b689b7d98f1bad7fbf06653d4693e19dfaf9592ebb12e8a9bb39c3f2ed0a2f1' 
  AND token = 'EJUAhfV0pg3kZ/Hnk+ACXvQu36Z6UnFJLwQvlldGevc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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