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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7b9d97a0ecd33262edddb6faff635939cba21e658b054b485714a74139d427' 
  AND token = 'G2VHHZOVpk3d5xg5MwaPTnoBew1IL4oTn/ZgWKeVEAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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