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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a661c9bdcdeb183afebfe78d8c03a8c556b7ca09ef60228261e3e096a766d32' 
  AND token = 'pRzFlkisaBs2YxC2XjVx8U8TZhMecKnp8WzdPuvtx8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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