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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af89adb6ae8715afd5ce7321e3584312dd05faad47c097204d94fb8a974041d' 
  AND token = 'hEnJbtwnDW2RHhhSrWAa+C254s4j3HbSx6ajbC4kj0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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