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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad565ea79950fe3519dba959b4569f77ca20ae0b561e212e1916e06fa356b4c' 
  AND token = 'KPa4NmBUXPgCcT17epmu3u8/sOsMly3QLI1wzEB9vAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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