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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ffbd26299469a167bd7e27438a8a4748832bba085da9b756a8dcf23ddd095d7' 
  AND token = 'vUv/yhxF0xHM3Llbi4fNQD7PHV9J55a0K5Xi1CQKfoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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