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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54b6ecdebf8b6407fa065231ba046bcf29a9221c08a8c883207e382d4ef5cf4' 
  AND token = 'K7YMY4wt83dqfaiuivd4nyXSOn9hhcUBOF1+vB+ItoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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