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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40bebf703556bc271cd8e40043abd7993c6dfa08dcdbb42b5126671d6e57b4f' 
  AND token = 'Mg/MhLtv2WwQq5AMI2+eXhkmg0P69x3qgCg7OlZaAas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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