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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20b90516ccdb009748939cc1137a861b67ad62d48889ff8223ef54e7656b3b8' 
  AND token = 'Q1Mq2UAnDGYa9Rf2bFkKNkyUf798cvu5ztQzK7jnJ+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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