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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d32415c457429c84810e0fa6316b86acb3f4807724abadeaef4b8b42675715b' 
  AND token = '0FkteX5J6yJ1Ne+ymxukgzzvn4q3K71Bbvhc9c/OywI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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