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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0d205bbf3b8794f8334c71cde0e565c05bad5711fe82202f4a3d9905d31994' 
  AND token = '+eZNWz0RGlaJ0yXIkUsBp4m70klvzOyxv8UpN1dgYsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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