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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962706009273b6937b98a00c6392a7049f83a0c02e7f869cfa951dc6f427a4de' 
  AND token = 'Qlil6llHbq1+OiBvOiUBwUpG8zUVtYQbE5gTcA+5fLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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