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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba569d9ec8bfce03a3a3b18106ea4dc64f4d29c8c5fe8fea45ac2e95b516eb5' 
  AND token = '3bZJG+2GOQSTXUtdP0WjDdS5W1DxEJpWSukPCi81N3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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