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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af656e8c50f6b879b29d15b97d666713f5ea6c4642d9b601c5c5cd3d90bb40b4' 
  AND token = 'zhdvVxxpyQ7Ej6VCJzdaptwy0z5wSaww+p/+mcPQt2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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