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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfa1f3d0b9d47515a8bc88c32e5093e798df26e5b9e33eaf88c1e95f57dc63d' 
  AND token = 'wuBUWNPm1vnA6PgXhjOaEziciCipF1l/xv8iO4zOwqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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