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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59a5e3146f9ab11f907ad63ef602b4debe4e6a71f520d26f36629eacdeaad15' 
  AND token = 'Y4iQ1FGafaWWKjKI7XvoGpS2rgk7PG11g4B5MBY59YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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