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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989601cdce6ec7656ef8e6d06047fc08ef89f47192d5cf4ac4fae2f5a7ae6232' 
  AND token = 'WLbqikAv/4WbCPxXYM80jHBoh2/sqWG7sHadGEByMRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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