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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3a50c00056d23551008a54badc0ca3d0120b5a86d80016207dd75e2fb00c60' 
  AND token = 'HAr+ZuONZIKcdCOy9fHp8mO+/0j9+Jt0vo3AAk2N3W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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