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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2da92daf970245c990f601eb77ee6e197da5a675f8ddfca7f5344af1512d46' 
  AND token = 'KM4e5z7W6bFO/zOh2o9MHXs5wN/Yk19MN/IlUBt/9jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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