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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a8db5801e8d2dc73acd00ff462c1641c986c1dcd125fecaf76a8b7310dd962' 
  AND token = '3nF593v3TYcjfwmPe4cPEKBZjW20Ez9a+gb5qHJWl8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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