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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa794971a72bf1eef9524b0ef5f6efd2b7b70cd3399521b0dc15eb7a554c17c7' 
  AND token = 'YDhVE0/7c3rcp7lP8YyVwqPzxoPxcS9U4A4bvqR2E08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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