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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4568a148e415cbd5685d480cd594d34bc82c2f349448c88c0789bbb744d20082' 
  AND token = 'aK9N+fwJwl7ACfYzIEK2Ot3IYZK4/YzYuDcSSUIxlmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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