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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795a724c0da3ed794702fc25e27e9603bf854acce533b1237733c5f0c4aec886' 
  AND token = 'e/FXfJO9hWfNCgP6pimiWSVqXhreN6QKa/VZQQb1YoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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