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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac1ffc8edaf287c99e19a5dceab3bfe1c7977870c61b3fe42fd93a85b5865cb' 
  AND token = 'siRmH/iitn5OAnL5idTARlMdsotJsj8O4h/xz0cR8GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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