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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ebb9a5e4845ce09675084d4f5b621a223fe18a8fe472309797b094ce72cc0e' 
  AND token = 'fcff+mY1rEBNR9KmyzcBqrNlSI7k8/JIqqH+NIRdwoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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